rom/exec/addresource.c

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Add a resource to the public list of resources.
   6     Lang: english
   7 */
   8
   9 #include <aros/kernel.h>
  10 #include <exec/execbase.h>
  11 #include <exec/rawfmt.h>
  12 #include <proto/exec.h>
  13 #include <proto/kernel.h>
  14
  15 #include <string.h>
  16
  17 #include "exec_debug.h"
  18 #include "exec_intern.h"
  19
  20 /* Kludge for old kernels */
  21 #ifndef KrnStatMemory
  22 #define KrnStatMemory(...)
  23 #endif
  24
  25 /*****************************************************************************
  26
  27     NAME */
  28
  29         AROS_LH1(void, AddResource,
  30
  31 /*  SYNOPSIS */
  32         AROS_LHA(APTR, resource, A1),
  33
  34 /*  LOCATION */
  35         struct ExecBase *, SysBase, 81, Exec)
  36
  37 /*  FUNCTION
  38         Adds a given resource to the system's resource list.
  39
  40     INPUTS
  41         resource - Pointer to a ready for use resource.
  42
  43     RESULT
  44
  45     NOTES
  46
  47     EXAMPLE
  48
  49     BUGS
  50
  51     SEE ALSO
  52         RemResource(), OpenResource()
  53
  54     INTERNALS
  55
  56 ******************************************************************************/
  57 {
  58     AROS_LIBFUNC_INIT
  59     ASSERT_VALID_PTR(resource);
  60
  61     /* Just in case the user forgot them */
  62     ((struct Node *)resource)->ln_Type=NT_RESOURCE;
  63
  64     /* Arbitrate for the resource list */
  65     Forbid();
  66
  67     /* And add the resource */
  68     Enqueue(&SysBase->ResourceList,(struct Node *)resource);
  69
  70     /* All done. */
  71     Permit();
  72
  73     /*
  74      * A tricky part.
  75      * kernel.resource is the first one to get initialized. After that
  76      * some more things can wake up (hostlib.resource for example).
  77      * They might want to use AllocMem() and even AllocPooled().
  78      * Here we switch off boot mode of the memory manager. Currently we
  79      * only set up page size for pool manager. When memory protection
  80      * is implemented, more things will be done here.
  81      * This allows to use exec pools even in kernel.resource itself.
  82      * To do this its startup code needs to be changed to call AddResource()
  83      * itself. Right after this exec's pool manager will be up and running.
  84      */
  85     if (!strcmp(((struct Node *)resource)->ln_Name, "kernel.resource"))
  86     {
  87         KernelBase = resource;
  88         DINIT("Post-kernel init");
  89
  90         /* If there's no MMU support, PageSize will stay zero */
  91         KrnStatMemory(0, KMS_PageSize, &PrivExecBase(SysBase)->PageSize, TAG_DONE);
  92         DINIT("Memory page size: %lu", PrivExecBase(SysBase)->PageSize);
  93
  94         /*
  95          * On MMU-less hardware kernel.resource will report zero page size.
  96          * In this case we use MEMCHUNK_TOTAL as allocation granularity.
  97          * This is because our Allocate() relies on the fact that all chunks
  98          * are at least MemChunk-aligned, otherwise we end up in
  99          * "Corrupt memory list" alert.
 100          */
 101         if (!PrivExecBase(SysBase)->PageSize)
 102             PrivExecBase(SysBase)->PageSize = MEMCHUNK_TOTAL;
 103
 104         /* We print the notice here because kprintf() works only after KernelBase is set up */
 105         if (PrivExecBase(SysBase)->IntFlags & EXECF_MungWall)
 106             RawDoFmt("[exec] Mungwall enabled\n", NULL, (VOID_FUNC)RAWFMTFUNC_SERIAL, NULL);
 107     }
 108
 109     AROS_LIBFUNC_EXIT
 110 } /* AddResource */